Graphhopper-osm-id-mapping use

Hi,
I’m new in graphhopper and java,and i want to get the osmEdges’id for the match result. I run the
osm-id-mapping-master\src\main\java\com\graphhopper\osmidexample\MyImport.java

the command lines is :

C:\Users\Administrator\Desktop\GraphHopper\osm-id-mapping-master\src\main\java>j
ava com\graphhopper\osmidexample.MyImport.java
Error: Cannot find or can’t load main class com\graphhopper\osmidexample.MyImport.java

and how can i do?